Do Movies Use Fake Weed Movie Weed?

Movie weed? - do movies use fake weed

I know that when you turn the inhalation of coke in a movie that most likey use powdered milk or something, but what they use to describe smoking weed? I have friends who smoke and smoke and in movies too much smoke from the weed. I do not how much weed is to hear that I know what is and is not Hödingen me back or anything. He has a good grade in school and my grade point average 3.4. However, the amount of smoke blow too much, unless these guys really know how to take a blow. Snoop statement I saw a lot of smoke in the videos and all, but I'm sure it's wrong, and only for the spectacle. What do they use to get that amount of smoke and used to smoke in movies? Thank you in advance for the answers.